Planck's constant, denoted by the symbol h, is a fundamental constant in physics that relates the energy of a photon to its frequency. It is named after German physicist Max Planck, who first introduced it in his research on blackbody radiation in 1900.
The experimental value of Planck's constant is important because it helps to accurately describe and predict the behavior of particles at the quantum level. It is a crucial factor in many physical equations, such as the Schrödinger equation, which is used to describe the behavior of atoms and molecules.
The experimental value of Planck's constant is determined through various experiments, such as the photoelectric effect and blackbody radiation. These experiments involve measuring the relationship between energy and frequency of particles, and using the value of Planck's constant to explain the results.
Yes, the experimental value of Planck's constant has changed over time as more accurate measurement techniques have been developed. The most recent accepted value, as of 2021, is 6.62607015 × 10^-34 Joule seconds.
A more precise experimental value of Planck's constant allows for more accurate predictions and understanding of quantum phenomena. It also allows for the development of new technologies, such as semiconductor devices, that rely on the principles of quantum mechanics and require precise values of Planck's constant.